TRS Group implemented an electrical resistance heating (ERH) remedy to remove trichloroethylene (TCE) in overburden soil surrounding a former dry well located at a manufacturing facility in Shenandoah, Virginia. TCE soil concentrations were measured at levels that were indicative of separate-phase liquid. Initial mass-in-place calculations estimated that there wereapproximately 22,000 pounds of TCE in the subsurface, and 55,000 were removed, TRS only used approximately 80% of the estimated energy to complete the remediation. The remedial goal was to reduce TCE concentrations to below an average of 2.1 mg/kg.

Background

The site was an active parts manufacturing facility and previous owner from 1965 to 1990 produced small electronic components, The cleanup standard for the remediation was developed to remove the contaminant source from the soil which would in turn decrease the size and lifespan of the offsite dissolved phase groundwater plume.

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Anionic: Have one or more negatively (-) charged groupings; commonly used in laundry detergent
Cationic: Have one or more positively (+) charged groupings, typically poor detergents but well suited for use as germicides, fabric softeners and emulsifiers.
Amphoteric: Contain both anionic and cationic groupings; prefer neutral pH and found in products such as hair shampoo, skin cleaners and carpet shampoo.
• Ionic Surfactants make up >99% of the sufactant used around the world
Non-ionic: Have no ionic...

ABSTRACT
High density sampling program was key to remediation of soil and groundwater impacted by TCE DNAPL at a former industrial site underlain by river deposits and sedimentary bedrock.
CHALLENGES
Impacted alluvium consisted of poorly sorted, fine to coarse grained sand. The source area was underlain by an aquitard of silt and clayey silt where dense non-aqueous phase liquid (DNAPL) pooled at the interface. Impacts did not extend into the underlying claystone bedrock. Solute transport was dictated by...